Optimized power management circuit for implantable rectenna for in-body medical devices

For many years, RF wireless harvesting systems have been investigated, but only a few of RF sources have been able to generate sufficient energy that can be used as feasible source for implantable medical devices like implantable rectenna, it could provide unlimited energy for the lifespan of implanted devices. In order to harvest the maximum power from implanted rectenna, power management system is needed. However, most of power management systems are not efficient due to power consumption in control circuitry. This paper presents a fabricated rectenna with 63% power efficiency and an optimized power management circuit to improve the efficiency of DC-DC converter, where the rectenna is used as power source, this is accomplished by using particle swarm optimization technique. This design improves the efficiency of optimized power management circuit by 10% comparing with conventional power management circuits over a wide range of input power, allowing harvesting more power from rectenna and delivering it to medical device; it can extend the battery life of implantable medical devices.